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Proc Natl Acad Sci U S A. Oct 1985; 82(20): 6731–6735.
PMCID: PMC390760

Rapid transient induction of phenylalanine ammonia-lyase mRNA in elicitor-treated bean cells

Abstract

DNAs complementary to a size-selected fraction of poly(A)+ RNA present in elicitor-treated cells of bean (Phaseolus vulgaris L.) were inserted into pAT153 and used to transform Escherichia coli strain C600. Five clones were identified by hybrid-selected translation and cross-hybridization that contained sequences complementary to mRNA encoding phenylalanine ammonia-lyase (EC 4.3.1.5), which catalyzes the first reaction of phenylpropanoid biosynthesis. The longest insert contained a single open reading frame of 1520 base pairs together with 223 base pairs of 3′ untranslated sequence. RNA blot hybridization showed that elicitor caused a rapid, marked but transient increase in phenylalanine ammonia-lyase mRNA that was closely correlated with changes in translatable mRNA activity in vitro and enzyme synthesis in vivo. Blot hybridization of newly synthesized mRNA purified by organomercurial affinity chromatography following in vivo pulse-labeling with 4-thiouridine indicates that elicitor caused a rapid stimulation of phenylalanine ammonia-lyase mRNA synthesis as an early in the defense response leading to accumulation of phenylpropanoid-derived phytoalexins.

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Selected References

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